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TIL Some mines are set to explode in response to changes in magnetic and acoustic fields. Sailors on minesweepers are not allowed to have wire coat-hangers because they could kill their magnetic signature and set off a mine.

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4kJW6 TIL the first computer bug was a literal bug: a moth found in a Harvard computer in 1947. They taped the insect in their logbook and labeled it "first actual case of bug being found."
Roo8 TIL Eminem composed ‘Lose Yourself’ entirely during breaks between shoots on the sets of 8 Mile.
Y8jW TIL: Approximately 10,000 attended the funeral of Hawaiian musician, Israel Kamakawiwoʻole.
9wAp TIL on October 21, 1978, a 20yo Australian pilot flying over the Bass Straight reported an aircraft flying 1,000ft above him. His last transmission to ATC was “it is hovering and it’s not an aircraft”. No trace of the pilot or his aircraft have been seen since.
LQP49 TIL Franz Ferdinand was widely disliked in the Austro-Hungarian Empire. His marriage to a woman without sufficient royal blood and his desire to give Slavs equal status by restructuring the empire into 3 kingdoms alienated Austrian conservatives and Hungarians, as well as pan-slavic nationalists.